Revenue from Contracts with Customers - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 565,128	$ 550,214
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	565,128	550,214
Americas | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	277,969	267,267
Europe | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	196,024	196,953
Asia-Pacific | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 91,135	$ 85,994